Waldek, Bill, yes, for correctness we need to distinguish
the inner domain and outer domain, and it's easy to
have a GENSYM() for each Maybe domain.

But that will hurt performance.

I think current situation is a good compromise. We can
say in documentation that all instances of Maybe share
a common value of failed(), and nested usage of Maybe
is not recommended, Maybe should not be used as Rep
itself but can be part of Rep.  Do you agree?

On the other hand, OnePointCompletion should be able
to nest, and it does.

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